How do I add a polygon?
How do I edit a polygon?
How do I add a point?
How do I move a point?
How do I copy, replace, or update geometry from one feature to another (point, line, polygon)
Updating Point Coordinates/Geometry
Buffer a Line or Track and Turn it into a Polygon - Web
Clip by Polygon Line Editing Tool
How to resolve invalid polygon geometry
Combine two or more polygons